Electrode for arc-lamps.



F. JANEC EK. ELECTRODE FOR ABC LAMPS.

APPLICATION FILE-D MAY 18, 1907.

Patented Nam-10, 1908.

FIGfk. Witnesses, J iii/( 12501 Manda cmz n e/q I a 2 a 6 I ceive it.

UNITED STATES PATENT OFFICE.

FRANZ JANE'CEK,

ELECTRODE Fort ARC-LAMPS.

To all whom it may concern:

Be it known thatl, FRANZ JANEonK, a subject of the Emperor of Austria-I-Iungary,residing at Karlin, near Prague, Bohemia, Austria- IIungary, have invented certain new and useful Improvements in Electrodes for Are- Lamps,=of which the following is a specification.

The resent invention relates to improvements in arc lamp electrodes of that type in which the rod is furnished with pins'or sto s, and my invention consists in roviding he electrode with stops rojecting romastrip of metal and thereforea lin metallic connection.

The invention is illustrated in the accompanying drawing, in which Figure 1 is a vertical section through a portion of the new are lam electrode. Fig. 2 is a cross section throug the same. Fig. 3 shows a cross section and side elevation respectively of a fragment of the metal strip folded ready for insertion into the electrode. Fig. 4 shows a cross section, edge view and Ian of a fra ment of the metal stri prior to being folded. Fig. 5 is a vertica section through a portion of an arc lamp fitted with the new electrode.

In carrying out my invention I employ a strip of sheet metal K having sinuous or corrugated i'narginal portions 1 (Fig. 4) and so stamped out centrally as to resent cross bars 1:, somewhat resembling t e rungs of a ladder. This metal strip is I bend or fold over on its longitudinal center-line, so that when seen in side elevation (Fig. 3) it presents approximately the form of a comb, whose back is constituted by the marginal bands 1, and whose teeth are represented by the doubled over bars 1:. This )cctinate metal strip 1 insert into the electrode A (Fig. l) which is longitudinally grooved. at a to rein Figs. 1 and 2 the groove n is shown of dovetail shape and the strip K can be readily inserted therein by pinching the two portions 1 logethcr and pushing them into the groove. The resilience of the strip will cause the parts 1 to press outward, whereby sullicient hold is obtained without the aid of auxiliary means.

The corrugations on the margins 1 make intimate contact with the electrode A at a sistance altogether redundant.

Specification ofLettex-a Patent.

Application filed May 16, 1907. Serial No. 373,997.

Patented Nov. 10, 1908.

Fig. 5 illustrates the manner in which the improved electrode is employed in an arc lamp. The coupling of the electrode A (Fig.

5), by means-of its uide pin 6, with the sli in member 2, is o tained by means of the be 1 crank contact lever 21, one contact arm 4 (if which is turned down obliquely against the side of the pin,- while its other, Weighted, arm 5 rests upon the top of the pin 6. In this manner a reliable contact of pin 6 with the arm 4 is assured since the supported electrode presses with its guide pin 6 against the arin 5. If the electrodes burn down, whereby further movement of the sliding member 2 is stopped by the stop 7, and the last electrode tooth c has dropped off the rest (I, then at the moment when the electrode A is no longer supported and drops, the contact between gul e pin 6 and arm 4 will be interrupted without sparking because the" arm 5 in 1 form the contact with the guide piece,

and the s arking takes breaking oi the contact 0 the gui( e pin 6 with the arin 5. The contact arm 4 and the side wall of the guide pin, therefore, are retected against being damaged by spar ing and a constant contact is assured.

Having thus described my invention, what I claim as new and desire to secure by'Letters Patent is- 1. An electrode for are lamps comprising a rod provided with a longitudinal dovetail roove and a ladder-shaped metal stri' .ou-

iled upon itself on its longitudinal axis, said doubled strip being located and held in the groove by its own resiliency and the points formed by the doubling orojecting beyond the rod, substantially as described. i

2. An electrode for are lamps comprising a rod provided with a longitudinal dovetail groove and a corrugated ladder-shap"d metal strip doubled u )on itself on its longitudinal axis, said doub led strip being located and held in the groove by its own resiliency and the points formed by the doubling projecting be 0nd the rod, substantially as described.

11 testimony whereof I allix-my signature in presence of two witnesses.

FRANZ JANECEK.

place onl upon Witnesses MILosLAv H wnr, Anot'rn l rso rnn. 

